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Other options for expansion of the tree and hiding all children of the current node are available by right-clicking on the object's entry in the Visibility Tree.
Saving the Display
Right click and select Save As to open the Export window, which will allow you to
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save the display to a variety of different graphics formats.
These include PNG, JPEG, GIF, and PNG.
Saving to HepRep will allow loading of the file later using the File -> Open menu. This is handy for loading back single displays of interesting events.